Performance Measure that Indicates Geometry Sufficiency of State Highways. Volume 1: Project Scoring and Network Screening.

摘要

The?Indiana?Department?of?Transportation?(INDOT)?selects?projects?for?implementation?by?taking?into?account?several?criteria?related?to?cross-section,?alignment?and?safety?to?evaluate?various?geometry?improvements?to?be?carried?out?as?a?part?of?projects.?The?existing?practice?uses?an?intuitive?point?allocation?method?to?score?these?individual?categories.?The?current?study?proposes?a?methodology?to?evaluate?these?projects?considering?the?safety?and?mobility?impacts?of?the?improvements?which?lie?in?the?scope?of?each?project.?This?methodology?is?also?used?to?screen?roads?based?on?existing?geometry?deficiencies?with?respect?to?a?desirable?design?standard.?The?road?screening?process?and?the?project?evaluation?process?form?two?steps?that?support?the?asset?management?process.?The?road?screening?process?helps?in?filtering?road?segments?based?on?geometry?deficiencies?and?identifies?the?least?adequate?road?segments.?Projects?may?be?further?developed?with?estimated?improvements?to?be?carried?out?on?such?segments?using?detailed?information?regarding?these?improvements.??The?asset?management?components?discussed?here?rely?on?the?evaluation?of?safety?and?mobility?benefits?corresponding?to?geometry?changes.?To?develop?an?up-to-date?method,?the?safety?performance?functions?used?in?this?method?have?been?calibrated?based?on?the?latest?crash?data?available?for?2009-2011.?Safety?performance?functions?have?been?developed?for?rural?two-lane,?rural?multi-lane,?urban?two-lane?and?urban?multi-lane?roads?in?the?state?of?Indiana.?The?crash?modification?factors?derived?from?these?safety?performance?functions?and?speed?adjustments?from?earlier?studies,?supplemented?with?data?available?in?Highway?Capacity?Manual?are?used?to?calculate?the?safety?and?mobility?benefits.